S-90409A121 1/4"-28 x 3/4" IFI 111, SAE J429 High-Strength Grade 8 Steel Flanged Hex Head Screws
High-Strength Grade 8 Steel Flanged Hex Head Screws
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Basic Information
Head Parameters
Dimensions
Thread Parameters
Tip & Drive Parameters
Material & Strength
Temperature & Environment
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Key Features & Benefits at a Glance
- Maximum load-bearing capability with 150,000 psi tensile strength for critical structural applications
- Superior corrosion and wear resistance through Grade 8 steel construction and Rockwell C32 hardness
- Enhanced stability and vibration resistance from the integrated flange design eliminating separate washers
- Precise thread engagement with Class 2A fine UNF threading for secure fastening in high-vibration environments
- High-torque installation capability through external hex drive design for efficient assembly
- Full-length threading providing consistent holding power across the entire fastener length
- Regulatory compliance assurance meeting SAE J429, RoHS 3, and REACH standards for global industrial use
Professional Applications & Engineering Value
This Grade 8 hex head screw delivers exceptional engineering value in demanding industrial environments where high tensile strength and vibration resistance are critical. The 1/4"-28 UNF fine threading provides superior thread engagement in materials prone to stress cracking, while the flanged design distributes clamping force evenly, preventing surface damage and maintaining joint integrity. Manufactured from high-strength steel with Rockwell C32 hardness, this fastener withstands extreme mechanical stresses in heavy machinery, automotive assemblies, and structural frameworks. The external hex drive enables high-torque installation, making it ideal for applications requiring precise preload control and reliable performance under dynamic loading conditions.
Specification Summary & Compliance
This Grade 8 hex head screw features precise Class 2A thread fit with 1/4"-28 UNF fine threading and right-hand thread direction. Manufacturing complies with IFI 111 specifications meeting SAE J429 standards for dimensional accuracy and mechanical properties. The fastener maintains full compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and material traceability for industrial applications worldwide.
